Barker's role in a psychodrama partly cut back (7)

I believe the answer is:

spaniel

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

'barker's' is the definition.
(I've seen this before)

'role in a psychodrama partly cut back' is the wordplay.
'SPANIEL' is hidden back-to-front within the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for spaniel that I've seen before include "See 1 Across" , "See 13" , "Dog - leaps in (anag)" , "Gundog; obsequious type" , "Long-eared dog" .)

I've seen this clue in The Telegraph.

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