Hill on track heading west — I start to climb moving on (7)
I believe the answer is:
nomadic
'moving on' is the definition.
(nomads move around)
'hill on track heading west i start to climb' is the wordplay.
'hill on track' becomes 'Damon' (race car driver Damon Hill).
'heading west' says the letters should be written backwards.
'start to' suggests taking the first letters.
The first letter of 'climb' is 'c'.
'damon' back-to-front is 'nomad'.
'nomad'+'i'+'c'='NOMADIC'
(Other definitions for nomadic that I've seen before include "Given to wandering like travellers or Bedouins" , "Not settling" , "Roaming" , "Unsettled" , "migrant" .)