It's more than likely it's for a lawyer involved in inquiry (8)
I believe the answer is:
probable
'it's more than likely' is the definition.
(I've seen this before)
'a lawyer involved in inquiry' is the wordplay.
'lawyer' becomes 'bl' (I've seen this in other clues).
'involved in' is an insertion indicator.
'inquiry' becomes 'probe' (probe is a kind of inquiry).
'a'+'bl'='abl'
'abl' going into 'probe' is 'PROBABLE'.
'it's for' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for probable that I've seen before include "Like to happen" , "Person most likely" , "on the cards" , "Likely to be the case" , "Likely to happen but not certain" .)