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North
American
cheers
most
of
experiment
involving
old
swimming
pools
(9)
North American cheers most of experiment involving old swimming pools (9)
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The definition is at the end of the clue.
How the clue works
Right, so swimming pools at the end is the definition — natatoria, plural of natatorium. For the wordplay, start with NA for North American, then TA for cheers, then take TRIAL (experiment) and drop the last letter to leave TRIA, popping O (old) inside it to give TORIA. Bung all those together, NA plus TA plus TORIA, and out pops the answer.