The most common and most likely answer to this crossword clue is the 5 letter word TRACE
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More clues leading to the result TRACE
Buddy explains!

The straight part
We know that "Suspicion/to follow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case suspicion/to follow = trace.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TRACE mean?
TRACE noun- An act of tracing.
- An enquiry sent out for a missing article, such as a letter or an express package.
- A mark left as a sign of passage of a person or animal.
- A residue of some substance or material.
- A very small amount.
- A current-carrying conductive pathway on a printed circuit board.
- An informal road or prominent path in an arid area.
- One of two straps, chains, or ropes of a harness, extending from the collar or breastplate to a whippletree attached to a vehicle or thing to be drawn; a tug.
- A connecting bar or rod, pivoted at each end to the end of another piece, for transmitting motion, especially from one plane to another; specifically, such a piece in an organ stop action to transmit motion from the trundle to the lever actuating the stop slider.
- (fortification) The ground plan of a work or works.
- The intersection of a plane of projection, or an original plane, with a coordinate plane.
- The sum of the diagonal elements of a square matrix.
- (grammar) An empty category occupying a position in the syntactic structure from which something has been moved, used to explain constructions such as wh-movement and the passive.
- To follow the trail of.
- To follow the history of.
- To draw or sketch lightly or with care.
- To copy onto a sheet of paper superimposed over the original, by drawing over its lines.
- To copy; to imitate.
- To walk; to go; to travel.
- To walk over; to pass through; to traverse.
- To follow the execution of the program by making it to stop after every instruction, or by making it print a message after every step.