Method of printing’s not working on gel (6)
I believe the answer is:
offset
'method of printing's' is the definition.
'offset' can be an answer for 'printing's' (offset is a kind of printing). I am not sure about the 'method of' bit.
'not working on gel' is the wordplay.
'not working' becomes 'off' (switched off).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'gel' becomes 'set' (I've seen this in another clue).
'off'+'set'='OFFSET'
Can you help me to learn more?
(Other definitions for offset that I've seen before include "Compensate(d) for" , "Compensation; printing technique" , "Amount by which something is out of line" , "Counterbalance(d)" , "make an effort" .)