A diminutive girl takes it in charge (5)
I believe the answer is:
debit
'charge' is the definition.
(debit is a kind of charge)
'a diminutive girl takes it' is the wordplay.
'a diminutive girl' becomes 'debi' (I am not sure about the 'diminutive' bit.).
'takes' says to put letters next to each other.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'debi'+'t'='DEBIT'
'in' is the link.
Can you help me to learn more?
(Other definitions for debit that I've seen before include "Record of a sum owed" , "Accounting entry showing sum owing" , "Payment made or owed" , "Money owed" , "Negative entry in the accounts" .)