Spellchecking in a function

I'm trying to do single word checking/replacement without having spell
checking set on permanently.

This is the first thing I tried:

fun! SpellCheckWord()
set spell
normal z=
set nospell
endfun

This brings up the suggestions list but doesn't allow me to enter a
number. Instead it displays at the bottom 'Press enter to continue' or
some such.

Next I tried using the spellsuggest() function:

...
call spellsuggest(expand'<cword>')
...

But this doesn't appear to do anything at all.

Any ideas?

TIA

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