what does "It’s not a stretch"mean?
He thought that the actor had heard that, too. Duffield drank his drink quickly, and tossed a few comments into the group beside them. Ciara sipped her cocktail, then nudged Duffield.
“How’s the film going, sweetie?”
“Great. Well. Suicidal drug dealer. It’s not a stretch, y’know.”
Everyone smiled, except Duffield himself. He drummed his fingers on the table, his legs jerking in time.
“Bored now,” he announced.
He was squinting towards the door, and the group was watching him, openly yearning, Strike thought, to be scooped up and taken along.
Duffield looked from Ciara to Strike.
“Wanna come back to mine?”
“Fabby,” squeaked Ciara, and with a feline glance of triumph at the brunette, she downed her drink in one.

Question

Answer

If something isn't a stretch, it's not difficult. It isn't a stretch for the actor to play a suicidal drug dealer because probably he's been both suicidal and/ or a drug dealer in the past or had dealings with drug dealers.

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