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It seems a hard one this week.

A challenge is good.

34a Few, with exception of wife, could be this uncompromising (4). I assume it is 'iron', but can't parse it, unless wife perhaps translates as lady? Any other ideas?

// Few, with exception of wife// ie Remove 'W'

Leaves

Fe - iron - uncompromising/robust

Iron

used figuratively as a symbol or type of firmness, strength, or resistance.
"her father had a will of iron"
synonyms: strength, toughness, resilience, fortitude, firmness, robustness, hardiness, steel

or perhaps Iago who tricked someone into killing his wife? not sure though.

Thanks, Mamya. Had not considered chemistry!