Squad also enthralled by scheme (7)
I believe the answer is:
platoon
'squad' is the definition.
(I know that platoon is a type of squad)
'also enthralled by scheme' is the wordplay.
'also' becomes 'too' (synonyms).
'enthralled by' means one lot of letters goes inside another ('enthral' can mean 'capture').
'scheme' becomes 'plan' (synonyms).
'too' going inside 'plan' is 'PLATOON'.
(Other definitions for platoon that I've seen before include "part of company" , "Group of soldiers" , "Army unit" , "Division of company" , "Subdivision of a company" .)