Ground tanks in Crete -- service provider required? (6,6)
I believe the answer is:
tennis racket
'service provider required?' is the definition.
I can't judge whether this defines the answer.
'ground tanks in crete' is the wordplay.
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'tanks'+'in'+'crete'='tanksincrete'
'tanksincrete' is an anagram of 'TENNIS-RACKET'.
Can you help me to learn more?
(Other definitions for tennis racket that I've seen before include "This could help one make a good return" , "One comes to court" , "Game equipment" , "Sports item" , "Scam at Wimbledon" .)