For small men, information on closing accounts (5)
I believe the answer is:
gents
'for small men' is the definition.
I can't tell whether this defines the answer.
'information on closing accounts' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'on closing accounts' becomes 'ts' (I can't justify this - if you can you should give a lot more credence to this answer).
'gen'+'ts'='GENTS'
Can you help me to learn more?
(Other definitions for gents that I've seen before include "toilet" , "Male loos" , "Men (colloq.)" , "Public convenience" .)