Small arachnid (4)
'small arachnid' is the definition.
(I know that tick are little)
This is all the clue.
(Other definitions for tick that I've seen before include "Case of a mattress" , "Small parasitic arachnid" , "Credit (sl.)" , "Moment - parasitic arachnid" , "Insect; noise of watch" .)
'small arachnid' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for mite that I've seen before include "Arachnid; small child" , "Child; a small amount" , "Tiny creature found in food" , "Minute creature" , "The widow's contribution, just in time" .)