World body backed agreement to hold vote without it (6)

I believe the answer is:

unsexy

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'without it' is the definition.
I can't tell whether this definition defines the answer.

'world body backed agreement to hold vote' is the wordplay.
'world body' becomes 'UN' (United Nations).
'backed' is a reversal indicator.
'agreement' becomes 'yes' (saying yes to something).
'to hold' is an insertion indicator.
'vote' becomes 'x' (how votes are marked).
'yes' enclosing 'x' is 'yxes'.
'yxes' backwards is 'sexy'.
'un'+'sexy'='UNSEXY'

Can you help me to learn more?

(Another definition for unsexy that I've seen is " "not stimulating libido"".)

I've seen this clue in The Times.

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