Search inside the shop for switches (6)
I believe the answer is:
shunts
'switches' is the definition.
(I've seen this in another clue)
'search inside the shop for' is the wordplay.
'search' becomes 'hunt' (synonyms).
'inside' is an insertion indicator.
'the shop for' becomes 'ss' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hunt' inserted within 'ss' is 'SHUNTS'.
Can you help me to learn more?
(Other definitions for shunts that I've seen before include "Moves a train from one track to another" , "Moves 6 dn from one track to another" .)