Lean brainbox who collaborated with Watson heard from Spooner with mystery (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Spoonerism of TIP (lean = slant away from the vertical) + CRICK (no, nothing to do with Sherlock Holmes: it’s Francis Crick, who worked with James Watson on the first published description of the double helix structure of DNA. In fact they relied on the work of a number of others, notably Rosalind Franklin, who didn’t get nearly enough credit at the time.) Some readers will no doubt complain that this isn’t a real Spoonerism because TIP CRICK isn’t a thing; I tend to agree.