Search people following one group avoiding fine security device (11,4)
I believe the answer is:
combination lock
'security device' is the definition.
(I've seen this before)
'search people following one group avoiding fine' is the wordplay.
I cannot really understand how this works, but
'search' could be 'comb' (combing is a kind of searching) and 'comb' is found in the answer.
'people' could be 'nation' and 'nation' is located in the answer.
'one' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for combination lock that I've seen is " security device".)