Add zest to or rips off rap session? (6)

I believe the answer is:

season

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'session?' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for season that I've seen before include "temper" , "' - - of mists ...' (Keats)" , "make things palatable" , "Add salt, pepper, spice etc" , "Add flavouring" .)

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

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