Complicated problem puzzling cows on farm (3,2,5)
I believe the answer is:
can of worms
'complicated problem' is the definition.
'can of worms' can be an answer for 'problem' (I've seen this before). I'm unsure of the 'complicated' bit.
'puzzling cows on farm' is the wordplay.
'puzzling' indicates an anagram.
'cows'+'on'+'farm'='cowsonfarm'
'cowsonfarm' is an anagram of 'CAN OF WORMS'.
Can you help me to learn more?
(Other definitions for can of worms that I've seen before include "which shouldn't be opened" , "amateur angler's bait?" , "this may turn out awkward" , "Something likely to prove awkward" , "Potential trouble" .)