Clockwise round the grid from 11 run three trios (8,4,6,5,9,3,5,8,4), each trio combining to suggest the same word. A trio of unclued lights combine to give a relevant activity (hyphened) and the remaining unclued light gives a relevant name verifiable in Brewer.
 

Across

9    Hat to be pleased with resembling a boater (10)
13    Sculptor and angler on good terms (5)
14    Brutes rector needles and opposes manfully (7)
15    Brilliant discoveries including European object (round) (7)
17    Brother painting timeless exotic shrubs (10)
19    Experiment involving El Salvador for example (5)
22    Rotter beginning to irk judge (4)
26    Courts have the Queen meeting fifth of judges (5)
28   ...