Slander hospital, receiving stick for muscle treatment (7)
I believe the answer is:
mudbath
'muscle treatment' is the definition.
(treatment for relaxing muscles)
'slander hospital receiving stick' is the wordplay.
'slander' becomes 'mud' (as in to drag someone's name through the mud).
'hospital' becomes 'h' (abbreviation for hospital on maps).
'receiving' indicates putting letters inside.
'stick' becomes 'bat' (bat is a type of stick).
'mud'+'h'='mudh'
'mudh' going around 'bat' is 'MUDBATH'.
'for' acts as a link.
(Other definitions for mudbath that I've seen before include "dirty rugby match?" , "Rheumatism treatment - thud bam (anag)" , "Treatment for the injured" , "Messy remedy" , "spa" .)