Please could someone help me with 21 across: Possible use for shortening lifeline? (6) P?S?R?
5 down: Private army in this hideout thrown into billet oddly (5,6) B?A?R ?A?T?E (all I can make is Blair battle !?)
14 down: Ignoring intro, reproduces best organ piece (4,4) R?E? S?O?
I feel it could be reed stop
with the last two I'd love an explanation of the wordplay
Thanks in advance