Crossword Help Forum
Forum Rules

Haven't had time to look at THIS week's one yet,
and just need to parse this one from the previous
week. 41 Down:- "Two sorts of men swallow iron
in the form of protein." (9) R-P-E-S-R
I imagine that only REPRESSOR/REPRESSER fits in
and can only think of "FE" for iron at the moment.

Iron is PRESS in RE (Royal Engineers) and OR (other ranks)

....and it's a protein in DNA control - see
http://en.wikipedia.org/wiki/Repressor

Thanks, ChrisE - pretty obvious now that
you've explained!