Rise to scratch head and leg? (4)
I believe the answer is:
limb
'leg?' is the definition.
(leg is a kind of limb)
'rise to scratch head' is the wordplay.
'rise' becomes 'climb' (synonyms).
'to scratch head' means to remove the first letter (I've seen 'scratched head' mean this).
'climb' with its first letter taken off is 'LIMB'.
'and' acts as a link.
(Other definitions for limb that I've seen before include "Tentacle" , "Eg wing" , "as part of plane, say" , "Part of body or branch of tree" , "Branch - arm - leg" .)