Bait chum in trouble? It's somewhat unreasonable (1,3,4)
I believe the answer is:
a bit much
'somewhat unreasonable' is the definition.
'a bit much' can be an answer for 'unreasonable' (I've seen this before). I'm not certain of the 'somewhat' bit.
'bait chum in trouble?' is the wordplay.
'in trouble?' indicates anagramming the letters (I've seen 'in trouble' mean this).
'bait'+'chum'='baitchum'
'baitchum' is an anagram of 'A BIT MUCH'.
'it's' is the link.
Can you help me to learn more?
(Other definitions for a bit much that I've seen before include "unfair" , "Somewhat unreasonable or OTT" , "unacceptable" , "Taking liberties" , "Butch ami may be excessive, beyond the limit" .)