She has a terribly hard round to get through (5)

I believe the answer is:

rhoda

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'she' is the definition.

'a terribly hard round to get through' is the wordplay.
'a terribly' is an anagram indicator.
'round' is an insertion indicator.
'to get through' becomes 'o' (I can't explain this - if you can you should believe this answer much more).
'hard' anagrammed gives 'rhda'.
'rhda' placed around 'o' is 'RHODA'.

'has' is the link.

Can you help me to learn more?

(Other definitions for rhoda that I've seen before include "Fem. name; hoard (anag.)" , "Girl's name; hoard (anag.)" , "Woman" , "Girl" .)

I've seen this clue in the Evening Standard.

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