Keep having bits of holidays (4)
I believe the answer is:
hold
'keep' is the definition.
(both can mean to have or possess something)
'having bits of holidays' is the wordplay.
'bits of' says to take the initial letters (I've seen 'bit of' mean this).
'holidays' becomes 'old' (I can't justify this - if you can you should give a lot more credence to this answer).
The initial letter of 'having' is 'h'.
'h'+'old'='HOLD'
Can you help me to learn more?
(Other definitions for hold that I've seen before include "See 12" , "Nelson?" , "Contain" , "Grip" , "Ship's cargo area" .)