Just for information, and curiously, Collins is the reference dictionary of choice for the Sunday Times crossword, even though it’s the BRB for the Listener.
“ We use two dictionaries as our main references for the Sunday Times crossword, both free online:
Collins English Dictionary — in the dictionary content at
https://www.collinsdictionary.com/ this is the source for the content marked as “English:”
Oxford Dictionary of English — this is the source for the UK Dictionary content at
https://www.lexico.com/“