Firm takes clear order for boat (7)
I believe the answer is:
coracle
'for boat' is the definition.
(coracle is a kind of boat)
'firm takes clear order' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'takes' indicates putting letters inside (take can mean to capture or invade).
'order' indicates anagramming the letters.
'clear' anagrammed gives 'racle'.
'co' going into 'racle' is 'CORACLE'.
(Other definitions for coracle that I've seen before include "Welsh version of the currach" , "See boat" , "Traditional rounded boat with wicker frame" , "One-man wicker boat" , "Small rounded boat" .)