It's responsible for a hold-up while the picture's in production (5)
I believe the answer is:
easel
'hold-up while the picture's in production' is the definition.
I can't tell whether this defines the answer.
'it's responsible for a' is the wordplay.
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'responsible' becomes 'sel' (I can't justify this - if you can you should believe this answer much more).
'for' means one lot of letters go next to another (I've seen this in other clues).
'sel' put after 'a' is 'asel'.
'e'+'asel'='EASEL'
Can you help me to learn more?
(Other definitions for easel that I've seen before include "Artist's equipment" , "Tripod for an artist" , "Painter's frame" , "board support" , "the rest of the paintwork" .)