It grows in moist, reedy places (4)

I believe the answer is:

tree

'it grows' is the definition.

'in moist reedy places' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TREE' is hidden in the letters of 'moist reedy places'.

(Other definitions for tree that I've seen before include "eg Rowan" , "Tall wooden plant" , "- Frog; - house" , "eg Box" , "Plant with bark" .)

I've seen this clue in the Evening Standard.

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