OAPs working cleaning bar (4)

I believe the answer is:

soap

I'm a little stuck... Click here to teach me more about this clue!

'cleaning bar' is the definition.
'soap' can be an answer for 'bar' (as in a bar of soap). I'm not sure about the 'cleaning' bit.

'oaps working' is the wordplay.
'working' indicates an anagram.
'oaps' anagrammed gives 'SOAP'.

Can you help me to learn more?

(Other definitions for soap that I've seen before include "Long running TV series" , "A cleansing sort of TV serial" , "It has detergent properties" , "Serialised drama" , "Cleansing TV serial drama" .)

I've seen this clue in The Times.

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