A passionate woman, she abandoned sightseers rambling about... (7)
I believe the answer is:
tigress
'a passionate woman' is the definition.
(I've seen this before)
'she abandoned sightseers rambling about' is the wordplay.
'she' becomes 't' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'abandoned' suggests removing the centre (middle letters abandon or vacate the word).
'rambling' indicates an anagram.
'about' is an insertion indicator.
'sightseers' with its middle removed is 'sigers'.
'sigers' anagrammed gives 'igress'.
't' inserted into 'igress' is 'TIGRESS'.
Can you help me to learn more?
(Other definitions for tigress that I've seen before include "Female big cat" , "A beastly female" , "Amazon, say" , "Fierce woman" , "Striped feline female" .)