Sea food from loch within range (4)
I believe the answer is:
alga
'sea food' is the definition.
(edible sea plant)
'loch within range' is the wordplay.
'loch' becomes 'l'.
'within' is an insertion indicator.
'range' becomes 'aga' (I've seen this before).
'l' inserted within 'aga' is 'ALGA'.
'from' is the link.
(Other definitions for alga that I've seen before include "Possibly tangle" , "Seaweed family group" , "Plants such as seaweed" , "Autotrophic organism" , "Water plant with no stem or leaves" .)