A sudden inclination to move miles up, maybe (7)
I believe the answer is:
impulse
'a sudden inclination' is the definition.
(I've seen this before)
'miles up maybe' is the wordplay.
'maybe' indicates an anagram.
'miles'+'up'='milesup'
'milesup' is an anagram of 'IMPULSE'.
'to move' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for impulse that I've seen before include "Strong urge to act" , "A sudden urge or whim" , "Maybe unthinking urge" , "Impel us with sudden urge" , "Whim; thrust" .)