Times 25,155

[PuzzPuzzPuzz]

10 Aggrieved about plan — what about it? It’s flagging (9) S_A_P_O_ _. 17 Nice support for a woman reversing charabanc (6) S_B_L_. SUBTLE?? If so, what's the wordplay? 20 Beat that backing system for sound (6) T_N_O_

[Zhukov]

Tannoy

[alcibiades]

tannoy

semaphore

[Zhukov]

yup..Subtle...bus reversed,,Bustle

[Pamaga]

Bustle then reverse the bus for subtle

[bert_h]

aggrieved = SORE, plan = MAP, what = EH, what about plan = EMAPH, aggrieved about that = S-EMAPH-ORE (signalling with flags).

[PuzzPuzzPuzz]

Thanks, everyone!