One gives it in haste (5)
I believe the answer is:
chase
'haste' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'one gives it' is the wordplay.
'one' becomes 'c' (I can't justify this - if you can you should believe this answer much more).
'gives' becomes 'has' ('have' can be a synonym of 'give').
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'c'+'has'+'e'='CHASE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for chase that I've seen before include "Hound" , "Composed type accommodated in this" , "grave, as before?" , "Pursue; decorate (metal) by engraving" , "groove" .)