Seven unclued lights (all real words) are names of 22 (hyphened) minus one letter. The missing letters give GROWN-UP.

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Lloyd Evans

What happened to Canterbury?

4    Game Charlie (athletic chap with a heart problem) (9)
10    Pro shinned nastily getting painkillers (10)
11    Rosy Lee and fellow almost dance (6, hyphened)
12    Secure university members axed watchman (7, two words)
14    Toast and honey? (5)
23    Cook tiresomely set out fishes (7)
24    Trudge with Yankee over middle of pampas (4)
25    Lass loves unending sleep (4)
27    Dishes possibly containing very Scottish coins (7)
29    Soldiers student doc out of college is meant to...