Tom maybe tense on top of large English farm animals (6)
I believe the answer is:
cattle
'farm animals' is the definition.
(I've seen this before)
'tom maybe tense on top of large english' is the wordplay.
'tom maybe' becomes 'cat' (a tom is a male cat).
'tense' becomes 't' (abbreviation used in many dictionaries).
'on top of' says to take the initial letters.
The initial letters of 'large english' is 'le'.
'cat'+'t'+'le'='CATTLE'
(Other definitions for cattle that I've seen before include "Livestock, kine" , "Jersey and Guernsey?" , "Where it naturally lies (Latin)" , "Farm livestock" , "Domesticated bovine animals" .)