Smaller type to row about in (6)
I believe the answer is:
tinier
'smaller' is the definition.
('tiny' can be similar in meaning to 'small')
'row about in' is the wordplay.
'row' becomes 'tier' (a tier is a row of things).
'about' indicates putting letters inside.
'tier' going around 'in' is 'TINIER'.
'type to' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for tinier that I've seen before include "Smaller than Dicken's Tim?" , "Even smaller" , "More constricted" , "more minute?" , "Much smaller" .)