Member's some Liberal I'm backing (4)

I believe the answer is:

limb

'member's' is the definition.
(limb is a kind of member)

'some liberal i'm backing' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'LIMB' can be found hidden inside 'liberal im backing'.

(Other definitions for limb that I've seen before include "Branch - member" , "Human's extension" , "Branch - arm - leg" , "A supporter" , "Arm, leg or wing" .)

I've seen this clue in The Sun.

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