1.  I thought 'pallid' for this but couldn't parse it apart from getting A51 = ALI stuck in my head
2. ???
3.  Crispin - charade of Invigorating (crisp) + fashionable (in).  Def - cobbler (patron saint)
4.  Dasheki - subtractive anagram - to play (anagram indicator) 'hide and seek' (fodder) minus (no) 'need'.  Def - shirt worn in Africa and the US
5.  ???
Jolan
Thanks for the brain stretching exercise, with your usual excellent clues.  Looking forward to the your answers and parsing - or aristophanes' :)