Clue: Hook-up on singular golf course, apparently taking time (7)
Answer: LINKAGE
Explanation: Hook-up on singular golf course, apparently taking time (7)
A charade of LINK (a 'golf course' – particularly one by the sea – is a links, which is originally a plural, but generally treated as singular; Maskarade is asking you to treat it as a plural, and take the 'singular') plus AGE ('time').