Wren
All-powerful

'Below The Surface'
The answers are creatures, plants or objects associated with water - salt or fresh.
No.1 Not liked by rowers 4
No.2 Will this spoil a rock garden 7
No.3 False when Red 7
No.4 Works `damn` hard 6
No.5 Stops water getting in or out 4
No.6 Have a grumble 4
No.7 Used to gallop across the water 3, 5
No.8 Part of the heart that may be warmed 6
No.9 Former male tennis star 5
No.10 Heavenly body for the King of the sea 7
No.11 60 seconds immediately 6
No.12 Well under par 9