Rambler almost here after covering one kilometre (5)
I believe the answer is:
hiker
'rambler' is the definition.
(I've seen this before)
'almost here after covering one kilometre' is the wordplay.
'almost' means to remove the last letter (almost the whole word is kept).
'after covering' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'kilometre' becomes 'k' (this could be a standard abbreviation which I don't know about).
'here' with its final letter taken off is 'her'.
'i'+'k'='ik'
'her' placed around 'ik' is 'HIKER'.
Can you help me to learn more?
(Other definitions for hiker that I've seen before include "Person on long walk" , "Rambler" , "Long-distance walker" , "Country walker" , "Someone walking (with backpack?)" .)