The occasional googly? How strange! (7)
I believe the answer is:
oddball
'strange' is the definition.
(I've seen this before)
'the occasional googly?' is the wordplay.
'the occasional' becomes 'odd' (I've seen this before).
'googly?' becomes 'ball' (I can't justify this - if you can you should give a lot more credence to this answer).
'odd'+'ball'='ODDBALL'
'how' is the link.
Can you help me to learn more?
(Other definitions for oddball that I've seen before include "Bold lad may be eccentric" , "Strange, bizarre" , "eccentric type" , "Eccentric person like peculiar sphere" , "Weird" .)