Unlucky drawn out formation (8)
I believe the answer is:
untoward
'unlucky' is the definition.
(I've seen this before)
'drawn out formation' is the wordplay.
'formation' indicates an anagram.
'drawn'+'out'='drawnout'
'drawnout' anagrammed gives 'UNTOWARD'.
(Other definitions for untoward that I've seen before include "Adverse - inconvenient" , "Drawn out to be inconvenient or awkward" , "Unexpected, undesirable" , "Unfortunate or adverse" , "vexing" .)