Fragment of Thomas Aquinas's autobiography is found in The Bahamas (6)
I believe the answer is:
nassau
'in the bahamas' is the definition.
('Nassau' is part of 'bahamas')
'fragment of thomas aquinas's autobiography' is the wordplay.
'fragment of' indicates the answer is hidden within the clue (I've seen this in other clues).
'NASSAU' can be found hidden inside 'thomas aquinass autobiography'.
'is found' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for nassau that I've seen before include "Port of the Bahamas" , "Saunas (anag)" , "Dublin street in the Bahamas?" , "Caribbean resort" , "city" .)