Singer following fashion? Not at all! (6,2)
I believe the answer is:
forget it
'at all' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'singer following fashion?' is the wordplay.
'singer' becomes 'tit' (type of songbird).
'following' means one lot of letters go next to another.
'fashion?' becomes 'forge' (synonyms).
'tit' put after 'forge' is 'FORGET IT'.
'not' acts as a link.
Can you help me to learn more?
(Other definitions for forget it that I've seen before include "There's no need for apologies" , "Not a chance" , "Let it go!" , "Think no more of the matter" , "ignore something" .)