Delicate colour of father's little telephone (6)
I believe the answer is:
pastel
'delicate colour' is the definition.
(I've seen this before)
'father's little telephone' is the wordplay.
'father's' becomes 'pa's' (pa can mean dad or father).
'little telephone' becomes 'tel' (short for telephone. I am not sure about the 'little' bit.).
'pas'+'tel'='PASTEL'
'of' is the link.
Can you help me to learn more?
(Other definitions for pastel that I've seen before include "Delicate colour found in plates" , "Type of crayon" , "Staple (anag)" , "Soft shade; crayon" , "Of a colour, subtle" .)