Colourful types heard at bullfights caught by The Drifters (5,5)

I believe the answer is:

lemon soles

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'the drifters' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.

'colourful types heard at bullfights caught' is the wordplay.
I cannot quite see how this works, but
'at' could be 'on' (location) and 'on' is found within the answer.
This may be the basis of clue (or it may be nonsense).

'by' is the link.

Can you help me to learn more?

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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