Resting from the rink will keep one at chair (9)
I believe the answer is:
officiate
'chair' is the definition.
(to chair is to act as a chair or officiate)
'resting from the rink will keep one at' is the wordplay.
'resting from the rink' becomes 'off ice' (not on an ice rink).
'will keep' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'i'+'at'='iat'
'office' going around 'iat' is 'OFFICIATE'.
(Other definitions for officiate that I've seen before include "Perform legal duties" , "Take chair" , "Conduct ceremony" .)