Criminal behind top site around Spain? It's irrelevant (6,3,5)
I believe the answer is:
beside the point
Here is my best explanation:
'irrelevant' is the definition.
(I've seen this before)
'criminal behind top site around spain?' is the subsidiary indication.
'criminal' indicates anagramming the letters.
'around' is an insertion indicator.
'spain?' becomes 'e' (abbreviation for Espania).
'behindtopsite' is an anagram of 'besidthepoint'.
'besidthepoint' placed around 'e' is 'besidethepoint'.
'it's' is the link.
(Another definition for beside the point that I've seen is "Irrelevant".)