Maybe Tom's in the majority (4)
I believe the answer is:
most
'majority' is the definition.
(most of a group)
'maybe tom's' is the wordplay.
'maybe' is an anagram indicator.
'toms' with letters rearranged gives 'MOST'.
'in the' acts as a link.
(Other definitions for most that I've seen before include "In the highest degree" , "Nearly all, majority" , "Kind of commercial pact where two countries agree to treat each other as well as any other" , "Extremely, very" , "Greatest in amount or degree" .)