Animal making dash over delta (5)
I believe the answer is:
eland
'animal' is the definition.
(thesaurus)
'dash over delta' is the wordplay.
'dash' becomes 'elan' ('elan' can be a synonym of 'dash').
'over' means one lot of letters go next to another.
'delta' becomes 'd' (phonetic alphabet: alpha, bravo, charlie etc.).
'elan'+'d'='ELAND'
'making' is the link.
(Other definitions for eland that I've seen before include "Large spiral-horned African antelope" , "Largest living antelope" , "Browser" , "wild creature" , "Spiral-horn antelope" .)