Gets smaller new missiles (7)

I believe the answer is:

narrows

'gets smaller' is the definition.

'new missiles' is the wordplay.
'new' becomes 'n'.
'missiles' becomes 'arrows' (arrow is a kind of missile).
'n'+'arrows'='NARROWS'

(Other definitions for narrows that I've seen before include "stretch of river" , "Constricts" , "Reduces in width" , "In space, restricts" , "Loses width" .)

I've seen this clue in The Guardian.

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