In a way, this month (4)
I believe the answer is:
inst
'this month' is the definition.
(I've seen this before)
'in a way' is the wordplay.
I cannot really understand how this works, but
'in' is present in the answer.
'way' could be 'st' and 'st' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for inst that I've seen before include "In brief, this month in correspondence" , "This month in brief, as in corres" , "Business notation meaning this month" , "'In the present month, in short (4)'" , "Business notation for the current month" .)