Suppress it? The nerve! (6)
I believe the answer is:
bottle
'nerve' is the definition.
(I've seen this before)
'suppress it? the' is the wordplay.
I cannot quite understand how this works, but
'it?' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
The remaining letters 'bole' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for bottle that I've seen before include "Glass or plastic container" , "Container for liquids" , "Grit" , "Heart" , "cool" .)