Change around tempo for sometimes high instrument? (9)
I believe the answer is:
altimeter
'instrument?' is the definition.
(altimeter is a kind of instrument)
'change around tempo' is the wordplay.
'change' becomes 'alter' (altering is a kind of changing).
'around' is an insertion indicator.
'tempo' becomes 'time' (I've seen this in another clue).
'alter' going around 'time' is 'ALTIMETER'.
'for sometimes high' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for altimeter that I've seen before include "It measures height above sea level" , "Aircraft instrument" , "Height sensor" , "Height gauge" , "Aircraft height indicator" .)