1: Scotsman to notice fundamental singular metaphysical entity (5)
4: Praiseworthy naval officer, English, found around boat's prow (9)
9: A month's work for a denizen of the deep (7)
10: Others acquired skill to turn over a new leaf (7)
11: Finish suddenly, like an oboe? (1, 4, 2, 3, 3)
12: One politician's a brat (3)
13: One later enters, like, with matching sides (11)
14: Beware of these they show the funny side of the month! (4,2,5)
19: Diet, sir! Clergy upset with fat constituents (13)
22: Language - one with a Latin derivation (7)
23: Half-finished meal precedes my look back at sacred mountain (7)
24: 'No to sobriety!' -- a cry going to produce unfortunate reputation (9)
25: Empty 3-down almost rolling in song (5)