Putting on thick coat, there’s nothing Picaroon’s too old for? (7)
I believe the answer is:
impasto
'putting on thick coat' is the definition.
'impasto' can be an answer for 'coat' (I have seen 'Thick coat' mean 'impasto' so perhaps 'coat' could also mean 'impasto'). I'm unsure of the 'putting on thick' bit.
'nothing picaroon's too old for?' is the wordplay.
I cannot really understand how this works, but
'nothing' could be 'o' (O resembles 0) and 'o' is located in the answer.
'picaroon's' could be 'im' (where the crossword setter is 'Picaroon') and 'im' is found in the answer.
'old' could be 'past' (similar in meaning) and 'past' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'there's' is the link.
Can you help me to learn more?
(Other definitions for impasto that I've seen before include "Thickly-applied paint" , "artist's application" , "Style of painting" , "application of paint in this way" , "Slapping paint on" .)