Old blower regularly blowing it? (4)
I believe the answer is:
oboe
'it?' is the definition.
I can't judge whether this defines the answer.
'old blower regularly blowing' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'regularly blowing' means one should take alternating letters (letters removed at regular intervals).
The alternating letters of 'blower' are 'boe'.
'o'+'boe'='OBOE'
Can you help me to learn more?
(Other definitions for oboe that I've seen before include "music producer" , "issuer of notes" , "Musical instrument" , "Woodwind instrument of treble pitch" , "Slender double-reed instrument" .)