One covers two miles in ten, going astray on the way (8)
I believe the answer is:
imminent
'one covers two miles in ten going astray on the way' is the definition.
I can't tell whether this defines the answer.
'one covers two miles in ten going astray' is the wordplay.
'two miles' means two replacements for 'miles'.
'one' becomes 'i' (Roman numeral).
'covers' says to put letters next to each other.
'miles' becomes 'm' (common abbreviation).
'miles' becomes 'm' (common abbreviation).
'going astray' is an anagram indicator.
'ten' with letters rearranged gives 'ent'.
'i'+'m'+'m'+'in'+'ent'='IMMINENT'
Can you help me to learn more?
(Other definitions for imminent that I've seen before include "Looming or impending" , "About to happen, looming" , "Approaching fast" , "Likely to occur at any moment" , "Close at hand, about to occur" .)