Not all climbers are agile (6)

I believe the answer is:

limber

'agile' is the definition.
(I've seen this in another clue)

'not all climbers are' is the wordplay.
'not all' indicates a hidden word (only some of the letters).
'LIMBER' is hidden within 'climbers are'.

(Other definitions for limber that I've seen before include "easily bent" , "Artillery equipment" , "Lithe" , "Able to move supply" , "Agile and flexible" .)

I've seen this clue in the Evening Standard.

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