"They say all lovers ___ more performance than they are able” (Troilus and Cressida) (5)

I believe the answer is:

swear

(Other definitions for swear that I've seen before include "Promise on oath" , "Vow; blaspheme" , "Emit oath or take vow" , "Asseverate" , "not to mince one's words" .)

I've seen this clue in The Times.

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