Dip in noise when busy, then problem returns (6)
I believe the answer is:
hummus
'dip' is the definition.
(I've seen this before)
'noise when busy then problem returns' is the wordplay.
'noise' becomes 'hum' (hum is a kind of noise).
'when busy then problem returns' becomes 'mus' (I can't explain this - if you can you should give a lot more credence to this answer).
'hum'+'mus'='HUMMUS'
'in' is the link.
Can you help me to learn more?
(Other definitions for hummus that I've seen before include "Spread made from chickpeas" , "Middle Eastern dip made of chickpeas" , "Dip made with chickpeas, tahini, lemon juice and garlic" .)