Give a lift to old love in one hour from Greenwich? (5)
I believe the answer is:
boost
'give a lift' is the definition.
(I've seen this in another clue)
'to old love in one hour from greenwich?' is the wordplay.
'to old' becomes 'o' (common abbreviation eg in OE for Old English).
'love' becomes 'o' (love means zero in tennis).
'in' indicates putting letters inside.
'one hour from greenwich?' becomes 'bst' (I am not sure about this - if you are sure you should believe this answer much more).
'o'+'o'='oo'
'oo' going into 'bst' is 'BOOST'.
Can you help me to learn more?
(Other definitions for boost that I've seen before include "Encourage; push up" , "Encourage or increase" , "Increase (strength or morale)" , "Uplift" , "Shot in the arm" .)