Lawrence's bird (4)

I believe the answer is:

wren

I'm a little stuck... Click here to teach me more about this clue!

'bird?' is the definition.
(wren is a kind of bird)

'lawrence's' is the wordplay.
'WREN' is hidden within the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for wren that I've seen before include "Very small brown songbird (4)" , "serving girl" , "Small brown bird 'hunted' on St Stephen's Day" , "Small British bird" , "Tiny bird" .)

I've seen this clue in the Evening Standard.

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