Face having to use an old phone? (4)
I believe the answer is:
dial
I believe this clue is a double definition.
'face' is the first definition.
(face of a clock)
'to use an old phone?' is the second definition.
(I've seen this in another clue)
'having' acts as a link.
(Other definitions for dial that I've seen before include "feature of old phone?" , "Ring the clock-face" , "Part of old telephone" , "Watch face" , "Clock face" .)