In the present case, here's a pushover for you! (4)
I believe the answer is:
gift
'a pushover for you' is the definition.
I can't tell whether this defines the answer.
'in the present case here's' is the wordplay.
'in the' indicates putting letters inside.
'present' becomes 'grant' (grant can mean to present or give).
'case' means to remove the middle letters.
'here's' becomes 'if' (I can't explain this - if you can you should believe this answer much more).
'grant' with its middle taken out is 'gt'.
'gt' going around 'if' is 'GIFT'.
Can you help me to learn more?
(Other definitions for gift that I've seen before include "Give away" , "bent" , "Natural talent" , "A present or gratuity" , "flair" .)