Make oneself visible; step up and take action (4,2,3,4)

Combustible heap used in certain funerals (4)

Sharply disagreeable; offensively irritating (8)

Sacred music piece featuring voice(s) and orchestra (7)

Irish river, historic battle scene of 1690 (5)

Dethrone; take forcibly (5)

Genuflects, from the old Chinese; bows and scrapes (7)

Ionic sin? (anag) (8)

Come into view; hover (4)

Wind monitor in which Force 8 is a gale (8,5)

Measure of someone's weight in relation to height (4,4,5)

The Venerable ----, the foremost Anglo-Saxon scholar (673-735) (4)

Feelings of allegiance; fidelity (7)

'The -----', nickname given the London Bridge Tower (5)

Branch; spin-off (8)

Aldous Huxley's vision of a future dystopian society (1932) (5,3,5)

End of the line; railhead (8)

Imply; suggest (7)

Burgundian city of gourmands: mustard (5)

Caledonian lake, often open to the sea (4)