What a star does if wife interrupts telephone call (7)
I believe the answer is:
twinkle
'what a star does' is the definition.
The definition suggests a comparative adjective but the answer is not.
'wife interrupts telephone call' is the wordplay.
'wife' becomes 'w' (abbreviation).
'interrupts' means one lot of letters goes inside another.
'telephone call' becomes 'tinkle' (tinkle can informally mean a telephone call).
'w' put inside 'tinkle' is 'TWINKLE'.
'if' is the link.
Can you help me to learn more?
(Other definitions for twinkle that I've seen before include "wink" , "Wet link (anag.)" , "Sparkle, gleam" , "scintillation" , "behave like a star?" .)