Racecourse regular’s attempt to attract attention during row (7)
I believe the answer is:
tipster
'racecourse regular's attempt' is the definition.
I can't judge whether this defines the answer.
'attract attention during row' is the wordplay.
'attract attention' becomes 'pst' (I can't explain this - if you can you should give a lot more credence to this answer).
'during' means one lot of letters goes inside another.
'row' becomes 'tier' (tier is a kind of row).
'pst' going within 'tier' is 'TIPSTER'.
'to' is the link.
Can you help me to learn more?
(Other definitions for tipster that I've seen before include "Supposed expert on horses" , "Seller of information on racecourse etc" , "One advising betters" , "Seller of inside information" , "Giver of betting advice" .)