Comes round to upping prices externally (7)
I believe the answer is:
rotates
'comes round' is the definition.
(to rotate is to turn around)
'to upping prices externally' is the wordplay.
'upping' indicates anagramming the letters (I've seen 'up' mean this (letters get chucked up)).
'prices' becomes 'rates' (I've seen this in another clue).
'externally' means one lot of letters goes inside another (some letters go on the outside of others).
'to' anagrammed gives 'ot'.
'ot' put into 'rates' is 'ROTATES'.
(Other definitions for rotates that I've seen before include "Turns round" , "revolves" , "Goes round" , "Spins round" , "Takes turns" .)