Designed manlier top? A jumper might go on this (10)

I believe the answer is:

trampoline

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'a jumper might go on this' is the definition.
The definition suggests a singular noun which matches the answer.

'designed manlier top?' is the wordplay.
'designed' indicates an anagram (designed with the letters).
'manlier'+'top'='manliertop'
'manliertop' with letters rearranged gives 'TRAMPOLINE'.

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(Other definitions for trampoline that I've seen before include "Sprung gymnastic equipment" , "where pike may count in competition" , "Trap oilmen (anag.)" , "Bouncy activity here" , "Spring up" .)

I've seen this clue in The Telegraph.

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