Heather from Argyll in Glasgow (4)
I believe the answer is:
ling
'heather' is the definition.
(synonyms)
'from argyll in glasgow' is the wordplay.
'from' says the answer is hidden in the clue.
'LING' can be found hidden inside 'argyll in glasgow'.
(Other definitions for ling that I've seen before include "Slender food fish" , "Heather - fish" , "Swimmer" , "Fish of the cod family" , "Burbot" .)