Fast runner on motorway getting some sultanas? (5)
I believe the answer is:
harem
'some sultanas?' is the definition.
(quarters for sultanas)
'fast runner on motorway' is the wordplay.
'fast runner' becomes 'hare' (I've seen this in another clue).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'motorway' becomes 'M' (as in motorway names - M1, M4 etc).
'hare'+'m'='HAREM'
'getting' is the link.
(Other definitions for harem that I've seen before include "women live here" , "Living quarters for wives and concubines" , "Where many wives" , "Female living quarters in a Muslim household" , "Collection of wives, concubines and female servants" .)