Appears to understand handwriting (5)
I believe the answer is:
seems
'appears' is the definition.
('seem' can be a synonym of 'appear')
'understand handwriting' is the wordplay.
'understand' becomes 'see' (synonyms).
'handwriting' becomes 'ms' (I can't explain this - if you can you should believe this answer much more).
'see'+'ms'='SEEMS'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for seems that I've seen before include "Appears, looks" , "Gives a certain impression" .)