Agree it's of small account and give in (6)
I believe the answer is:
accede
'agree' is the definition.
(acceding is a kind of agreeing)
'account and give in' is the wordplay.
'account' becomes 'ac' (abbreviation for account).
'and' is a charade indicator (letters next to each other).
'give in' becomes 'cede' (I've seen this in another clue).
'ac'+'cede'='ACCEDE'
'it's of small' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for accede that I've seen before include "Consent - agree" , "Yield" , "Agree to proposal or take office" , "Succeed to or allow" , "Agree (to) - come into office" .)