Forms in English hidden in boxes (7)
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I believe the answer is:
creates
'forms' is the definition.
The answer and definition can be both to do with creating things as well as being verbs in their -s form.
Maybe there's a link between them I don't understand?
'english hidden in boxes' is the wordplay.
'english' becomes 'E' (abbreviation).
'hidden in' is an insertion indicator.
'boxes' becomes 'crates' (crate is a kind of box).
'e' inserted inside 'crates' is 'CREATES'.
'in' is the link.
Can you help me to learn more?
(Other definitions for creates that I've seen before include "Complains" , "coins" , "Brings into existence" , "Makes" , "Produces" .)
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