Crossword Genius

Tolerating Jolson sounding like a cow? (8)

Ross

I believe the answer is:

allowing

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

'tolerating' is the definition.
The definition and answer can be both related to thinking as well as being present participle verbs.
Perhaps they are linked in a way I don't understand?

'jolson sounding like a cow?' is the wordplay.
'jolson' becomes 'Al' (Al Joson singer).
'sounding like a cow?' becomes 'lowing' (I can't justify this - if you can you should give a lot more credence to this answer).
'al'+'lowing'='ALLOWING'

Can you help me to learn more?

(Other definitions for allowing that I've seen before include "Permitting or conceding" , "Granting, permitting" , "Admitting" , "not stopping" , "Giving permission" .)

I've seen this clue in The Guardian.
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