International group mostly attractive in its original form? (5)
I believe the answer is:
uncut
'in its original form?' is the definition.
(I've seen this in another clue)
'international group mostly attractive' is the wordplay.
'international group' becomes 'UN' (United Nations).
'mostly' means to remove the last letter (most but not all of the word).
'attractive' becomes 'cute' (similar in meaning).
'cute' with its last letter removed is 'cut'.
'un'+'cut'='UNCUT'
(Other definitions for uncut that I've seen before include "(Like a book) with pages not trimmed" , "Of a film, complete and uncensored" , "diamonds, originally" , "State of raw unprocessed diamond" , "total" .)