City's first matches, under review, involving one set of questions (9)
I believe the answer is:
catechism
'one set of questions' is the definition.
(I've seen this before)
'city's first matches under review' is the wordplay.
I cannot quite understand how this works, but
'first' could be 'i' (I in Roman numerals eg Elizabeth I) and 'i' is located in the answer.
an anagram of 'matches' is 'atechsm' which is located in the remaining letters.
A single letter 'c' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'involving' is the link.
Can you help me to learn more?
(Other definitions for catechism that I've seen before include "Set of questions for religious teaching" , "summary of belief" , "Schematic for religious principles in question and answer format" , "Q&A session" , "Series of questions" .)