Infatuated with spots (5)
I believe the answer is:
dotty
'infatuated' is the definition.
(synonyms)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for dotty that I've seen before include "Barking" , "like a Dalmatian?" , "Silly; crazy" , "Slightly mad (colloq.)" , "Feeble-minded" .)