I'm surprised face is friendly (7)
I believe the answer is:
cordial
'friendly' is the definition.
(similar in meaning)
'i'm surprised face' is the wordplay.
'i'm surprised' becomes 'cor' (old-fashioned UK expression of shock or awe).
'face' becomes 'dial' (face of a clock).
'cor'+'dial'='CORDIAL'
'is' is the link.
(Other definitions for cordial that I've seen before include "Agreeable - drink" , "Affable type of sweet drink?" , "7 [HEARTY]" , "drink with a fruity flavour" , "stimulating drink" .)