Mousy (5)

I believe the answer is:

timid

'mousy' is the definition.
(similar in meaning)

This is the entire clue.

(Other definitions for timid that I've seen before include "Lacking self-confidence" , "doormat" , "Easily alarmed, shy" , "Diffident, faint-hearted" , "Lacking in courage" .)

I've seen this clue in The Guardian.

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