Times 26046

[Bogtrotter]

Struggling with the top half 3d Too serious back in romantic retreat, topless: 0?????d?e?t. 10a Fleet Street shunned by celebrity married lady: a?m???. Also 14a Protest about Belgian town's sleepy state: ??m?n?t?a??? - is it demonstrates? Can't work it out.

[Lie-in King]

3d Overearnest - 'rear' (back, in) '(l)ove nest' (romantic retreat, topless)
10a Armada (fleet) - '(st)ar' (celebrity, no 'st[reet]') + 'm(arried)' + 'Ada' (lady)
14a Re-Mons-trance

[1581960]

3d overearnest
10a armada
14a re mons trance

[Bogtrotter]

Thanks for those - no wonder I couldn't find anything for 3d!