Explain the meaning of painter prettifying frames (9)

I believe the answer is:
interpret
'explain the meaning' is the definition.
'interpret' can be an answer for 'explain' (interpreting is a kind of explaining). I'm unsure of the 'the meaning' bit.
'of painter prettifying frames' is the wordplay.
'of' indicates the answer is hidden within the clue.
'INTERPRET' is hidden within 'painter prettifying frames'.
Can you help me to learn more?
(Other definitions for interpret that I've seen before include "Construe" , "Explain the meaning of - another language?" , "Orally translate" , "Restate from one language into another" , "Translate or take one's own meaning from" .)
