Cold female unable to get muscles moving? (6)
I believe the answer is:
frigid
'cold' is the definition.
(I know that cold can be written as frigid)
'female unable to get muscles moving?' is the wordplay.
'female' becomes 'f' (common abbreviation).
'unable to get muscles moving?' becomes 'rigid' (rigid can mean firm or inflexible).
'f'+'rigid'='FRIGID'
(Other definitions for frigid that I've seen before include "Glacial" , "Stiff - cold - formal" , "Frosty" , "Sexually unresponsive" , "Very cold; formal in behaviour" .)