Too may 'part of' clues here for it to be a good grid. Reasonable attempt etc.

Lots of wrong turns but solutions are odd.

Apologies if this is rather difficult to remedy, but how is 'NFL Nicknames' incorrect for the first chain?

Additionally, agreed with the 'part of' clues - rather too vague.

Good sources and good breadth of information touched upon; just needs some work :-)

Grid Squad -- really helpful comment, thanks very much.

RMD, fishface, Stan Dup ... my first attempt so pleased to get some constructive feedback. I did wonder whether the "part of" clues were really "playing the game". I'll try to do better next time!