Shakily grips a branch (5)

I believe the answer is:

sprig

'a branch' is the definition.
(sprig is a kind of branch)

'shakily grips' is the wordplay.
'shakily' indicates anagramming the letters.
'grips' with letters rearranged gives 'SPRIG'.

(Other definitions for sprig that I've seen before include "A child" , "Headless nail; leafy ornament" , "Small stem bearing flowers" , "Small twig" , "Grips with a small branch" .)

I've seen this clue in the Evening Standard.

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