Drum in time with game old doctors travelling north (7)
I believe the answer is:
tambour
'drum' is the definition.
(tambour is a kind of drum)
'time with game old doctors travelling north' is the wordplay.
I cannot quite understand how this works, but
'time' could be 'am' and 'am' is found in the answer.
'old' could be 'o' (abbreviation) and 'o' is present in the answer.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for tambour that I've seen before include "feature of some courts" , "construction of sewers" , "Circular frame to hold fabric tight for embroidery" , "flexible desktop" , "circle for 13 [NEEDLEWORK]" .)