Mean to grab one or two (4)
I believe the answer is:
pair
'two' is the definition.
(pair is a kind of two)
'mean to grab one' is the wordplay.
'mean' becomes 'par' (I've seen this before).
'to grab' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'par' going around 'i' is 'PAIR'.
'or' acts as a link.
(Other definitions for pair that I've seen before include "Two of a similar type" , "Couple - wed" , "Twins" , "players of duet?" , "how braces come" .)