The force to pump up tyres? (3,5)
I believe the answer is:
air power
'the force to pump up tyres?' is the definition.
I can't tell whether this defines the answer.
'the force to pump' is the wordplay.
'the force' becomes 'power' ('power' can be a synonym of 'force').
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'pump' becomes 'air' (air pump is a kind of pump).
'power' after 'air' is 'AIR POWER'.
Can you help me to learn more?
(Other definitions for air power that I've seen before include "Military" , "might get this from a wind farm?" , "Flying strength" .)