Faceless oafs backing industrial action, mostly in suburbs (9)
I believe the answer is:
outskirts
'in suburbs' is the definition.
(I've seen this before)
'faceless oafs backing industrial action mostly' is the wordplay.
'faceless oafs' becomes 'outs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'backing' says the letters should be written in reverse.
'industrial action' becomes 'strike' (workers going on strike).
'mostly' means to remove the last letter (most but not all of the word).
'strike' with its final letter taken off is 'strik'.
'strik' reversed gives 'kirts'.
'outs'+'kirts'='OUTSKIRTS'
Can you help me to learn more?
(Other definitions for outskirts that I've seen before include "Outer regions (of town)" , "Edges (of town)" , "surrounding area" , "Periphery" , "area away from town centre" .)