6  To write mournful poem on the Spanish, for example, is emotional at first (7)

 7  Be informed about the purple-flowered moorland plant (7)

 9  Rough, mostly hard stony hill for starters (5)

10 Moved along a course principally twisted and tangled (9)

11 Furious refusnik, not ultimately one to slowly introduce something (7)

13 Dark and gloomy unspecified number going round Britain (6)

15 Beetle (it's said) with Wings celebrated this promontory (4,2,7)

19 Anger following old Department of Education and Science request (6)

20 Court house involved in reactionary relief with sentence finally cut for thief (7)

23 Brief time international organisation took originally active in southern land masses (9)

24 Heading off to chatter and gas (5)

26 Passage Franklin was searching for at compass point 315° (7)

27 25 downs' foremost of verdant passages (7)

 2  Dark hours, things seen with different polarity (6)

 3  Richer person who gambles money away (6,3)

 4  One who accepts challenge, maybe, subsequently too upset to settle down (4,4)

 5  Life force lady regularly brings into relief primarily with the brief process of parturition (10)

 6  Concerning nations and French, Hungarian, Norwegian, Irish and Croat initially (6)

 7  Have news of frisky hare (4)

 8  Journeys around German hill ranges (6)

12 Straightforward price of passage involving our group of team players with no publicity (4-6)

14 Extending round America, I've put under Defence Intelligence very loudly (9)

16 Behold setter brought up courtesans! (8)

17 Peculiar fellow, one who is frequently left out (3,3)

18 Duke and gentleman turning up: lazy, idle people (6)

21 Exposed to risk, Light Infantry having sufficient strength (6)

22 Reportedly discovered the absence of thin fog (4)

25 Characters in panel game give rise to depression (4)