Clue: Cattle and duck kiss, seen on-and-off (4)
Answer: OXEN
Explanation: Definition: Cattle
~~A charade of O ('duck', cricket) plus X ('kiss, seen" – indicating a written representation of a kiss) plus 'on'-, with -'and-off' indicating that the first 'and' in the clue is to be ignored. A couple of unusual devices in this clue, but I think my interpretation makes sense of it.~~ *A charade of O ('duck', cricket) plus X ('kiss') plus EN ('se**EN** on-and off' or 's**E**e**N** on-and off'; either way "off-and-on" might have been more descriptive).