Squad extremely grabbed by suggestion (7)
I believe the answer is:
platoon
'squad' is the definition.
(I know that platoon is a type of squad)
'extremely grabbed by suggestion' is the wordplay.
'extremely' becomes 'too' (I've seen this in other clues).
'grabbed by' is an insertion indicator (inserted letters are grabbed inside).
'suggestion' becomes 'plan' (plan can mean a suggestion or idea).
'too' inserted inside 'plan' is 'PLATOON'.
(Other definitions for platoon that I've seen before include "Small body of soldiers" , "Team under lieutenant" , "Subdivision of a company" , "Sub-unit of a military company" , "Infantry unit" .)