Forbid a bachelor to have a bit of fun (3)

(Source: London Evening Standard)

"a bachelor" ⇒ as in Bachelor level of academic degree, e.g. "BA" or "BSc"

"a bit of fun" ⇒ a small subset of the word "fun" ⇒ e.g. "fun"

General meaning ⇒ to forbid, disallow

Answer ⇒ ban