More in band about to split (8)
I believe the answer is:
trendier
'more in' is the definition.
(I've seen this before)
'about to split' is the wordplay.
'about' indicates putting letters inside.
'to' becomes 'tier' (I can't explain this - if you can you should give a lot more credence to this answer).
'split' becomes 'rend' (I've seen this in other clues).
'tier' placed around 'rend' is 'TRENDIER'.
'band' acts as a link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for trendier that I've seen before include "More stylish, up-to-the-minute" , "cooler" , "Rather fashionable" , "More up with the latest fashions" , "more fashion-conscious?" .)