Undemanding diversion, then, a period in Lichtenstein's career? (4,5)

I believe the answer is:

soap opera

'undemanding diversion' is the definition.

'then a period in lichtenstein's career?' is the wordplay.
'then' becomes 'so' (both can mean 'therefore' or 'in that case').
'period in lichtenstein's career?' becomes 'popera' (Roy Lichtenstein pop artist).
'so'+'a'+'popera'='SOAP-OPERA'

(Other definitions for soap opera that I've seen before include "TV show" , "TV programme" , "Television serial" , "addictive programme?" , "Melodramatic TV serial" .)

I've seen this clue in The Everyman puzzle in The Observer.

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