ADJ

good, reliable, sure
poor, unreliable
Level of education is actually quite a poor indicator of ability to run a business well
sensitive
crude, partial, rough
simple
key, leading, main, major
important, significant
useful, valuable
economic, financial, performance, social, socio-economic
performance indicators such as language and numeracy skills

VERB + INDICATOR

be, serve as
These warts can serve as an indicator of other infections
provide (sb with)
regard sth as, see sth as, take sth as
Gold prices are often seen as an indicator of inflation
use (sth as)
develop
It is still difficult to develop indicators for many concepts used in social science

INDICATOR + VERB

show sth, suggest sth
Economic indicators suggest that a recovery is on the way

PREP

~ for
an indicator for the presence of minerals