Crossword Genius

The 51st catalogue? (4)

Ross

I believe the answer is:

list

I'm a little stuck... Click here to teach me more about this clue!

'catalogue?' is the definition.
(a catalogue is a list of items)

'the 51st' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
The remaining letters 'lis' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for list that I've seen before include "Ordered array of items" , "band > record" , "Itemised catalogue" , "Heel - catalogue" , "Inventory" .)

I've seen this clue in the Evening Standard.
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